Whoopsy:
Enmanuel:

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Ignoring the bigger side inlet vent of the Aventador, these 2 cars are very similar in profile. The overall silhouette is the same, the cockpit glass shape is the same, the taper treatment of the rear is the same. The front treatment is almost the same too.

Aventador has a bigger side inlet simply due to the bigger engine needs more air. 

The large side inlets on the Aventador are to allow airflow to the side mounted radiators that flank the engine.  The smaller Lamborghini has front mounted radiators.